British scientists have identified another new variant of coronavirus in the country with some potentially troubling mutations.
B.1.525 appears similar to the South African variant which prompted door-to-door tests in areas, researchers from Edinburgh University said, adding that they have found 33 cases so far in samples dating back to December.
It has been seen in other countries too, including Denmark, Nigeria and the US.
UK experts are studying it to understand what risk it poses.
It is too soon to say if it should be added to the UK's list of "variants of concern" and whether mass testing for it should happen.
Prof Ravi Gupta, from the University of Cambridge, is one of the scientists advising the government on new and emerging virus threats.
He said B.1.525 appeared to have "significant mutations" already seen in some of the other new variants.